Dumbbell stand



FIG. 1 shows a front perspective view of a dumbbell stand in accordance with the present design;

FIG. 2 shows a front elevation view of the dumbbell stand of FIG. 1;

FIG. 3 shows a rear elevation view of the dumbbell stand of FIG. 1;

FIG. 4 shows a right elevation view of the dumbbell stand of FIG. 1;

FIG. 5 shows a left elevation view of the dumbbell stand of FIG. 1;

FIG. 6 shows a top view of the dumbbell stand of FIG. 1; and,

FIG. 7 shows a bottom view of the dumbbell stand of FIG. 1.

The broken lines illustrate portions of the dumbbell stand that form no part of the claimed design. 

CLAIM The ornamental design for a dumbbell stand, as shown and described. 